<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>
    </title>
    <link rel="stylesheet" href="../../common/moblie-reset.css">
</head>
<style>
    .box {
        width: 50px;
        height: 50px;
        background-color: aqua;
    }
    
    @media screen and (min-width:320px) {
        .box {
            background-color: red;
            width: 100px;
            height: 100px;
        }
    }
    
    @media screen and (min-width:540px) {
        .box {
            background-color: blue;
            width: 200px;
            height: 200px;
        }
    }
    
    @media screen and (min-width:640px) {
        .box {
            background-color: black;
            width: 300px;
            height: 300px;
        }
    }
    
    @media screen and (min-width:750px) {
        .box {
            background-color: darkcyan;
            width: 400px;
            height: 400px;
        }
    }
</style>

<body>
    <div class="box"></div>
</body>

</html>